Where does this definition of slow sand filter come from?
This entry for slow sand filter is sourced from GetWord Corpus, one of the dictionaries and corpora merged into Lughet.
Does slow sand filter appear elsewhere on Lughet?
Yes — slow sand filter appears under other sources or language pairs in Lughet's collection. See the list below.
What is Lughet?
Lughet is a free trilingual dictionary covering nearly five million entries across Uyghur, Chinese, and English, drawn from more than ten source dictionaries and corpora.